In an alternative universe, instead of hearing about gene therapy for:

Cancer

Alzheimer's

Parkinson's

we'd be hearing about gene therapy for:

Hair loss

Hair color

Hair style

Eye color

Skin color

Perfume

Effects of aging

Weight loss and gain

Muscle growth

Body part enhancement

Chicken that tastes like bacon

For the yellow outfit you're wearing today you might pick a light
brown skin tone and green eyes. You'd use the light brown skin tone
body wash to change the genes in your skin. You'd put in the green eye
eyedrops to deliver the genes into your eyes. You'd place a stencil on
your skin and use a spray to deliver genes for a light skin color tone
to form a tattoo. You'd deliver citrusy scent genes to the
odor-creating bacteria on your skin to produce that smell today.

But we don't live in that alternate universe. Instead of all these
miracles, all we're going to get is a cure for cancer.